USD forks were introduced into the motorbike world to make last years model look so out of date and so inefficient. Then a year later when the power rangers who had clocked up an all impressive 1500 dry miles in 12 months, the motor trade would offer them a pittance for their mint nick bike knowing they just had to have the next model because it had another gimmick, which after USD forks was radially mounted brake callipers.
What we are seeing here is market(ing) forces.
THe only benefit I see to USD MTB forks is the LBS’s will clean up selling new fork seals after the owners have learnt the lesson of neglect, corrosion and stone damage to the lower fork stanchions